Yealink SIP-W52P is a wireless VoIP DECT system, consisting of a base station and the handset. The system can be expanded up to five additional handsets (Yealink SIP-W52H), each of which can have its own SIP account. Like other VoIP DECT systems, Yealink W52P will work from a distance of 50 meters from the base in the closed space and up to 300 meters in open space.
IDC projected over 9 billion minutes of voice traffic to travel over worldwide packet networks in 2000, exceeding 135 billion minutes in 2004. Service revenue is projected at 1.6 billion in 2000 and 18.7 billion in 2004.